Making long seamless thin-rolled tubes out of warm solid blocks of metal.



L. WOLFFGRAM. MAKING LONG SEAMLESS THIN ROLLED TUBES OUT OF WARM SOLID BLOCKS 0F METAL.

APPLICATION FILED JUNE 6, i9l5.

Patented Dec. 19, 1916.

o m M W WI T/VESSES:

A rromvey UNITED STATES PATENT OFFICE.

LUDW IG WOLFFGBAM, F BROOKLYN, NEW YORK.

MAKING LONG SEAMLESS THIN-ROLLED TUBES OUT OF WARM SOLID BLOCKS O1" METL.

Specification of Letters Patent.

Patented Dec. 19, 1916.

Application filed June 16, 1916. Serial No. 84,367.

To all whom it may concern Be it known that I, LUDWIG WOLFFGRAM, a citizen of the .German Empire, and a resident of New York, in the borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Making Long Seamless Thin-Rolled Tubes Out of Warm Solid Blocks of Metal, of which the following is as ecification.

his invention relates to improvements in making long seamless thin rolled tubes out of warm solid blocks of metal. Heretofore, such tubes were made with the use of a long rod having at its end a guided mandrel. and supported by guide blocks arran within an outer casing, which guide bloc s were pushed along the interior of the casing by the tube as'Tt' was gradually formed from. the block passing over the mandrel. -On the completion of the tube formation, these guide blocks were pushed out of the casing at its end distant from the mandrel end of the rod, and while surrounding the rod and supported thereby, were removed therefrom. On the entire completion of the tube, and its extraction from the casing, the guide blocks were again inserted into the casing to proper position in the casing to be in working position for the next tube formation. This systemhad several disadvantages. Among these was that the rod within the casing could not be conveniently co'oled as it became heated. Another was that the guide blocks were inconvenient in manipulation, and anothenwas that during the formation the services of the workmen were .not efficiently utilized, in that they could not do anything until the tube was completed, while thereafter the positioning of the guide blocks was wasteful in time, with consequent ex ense in operation.

y improvement overcomes these d sadvantageous features, and by roviding independently operating guide b ocks formed of two parts so as to be readily removed or placed in position, the outer casing done away with, and a cooling of the rod 18 readily made possible, as also time is saved, and at the same time the services of the Workmen can be utilized during the forming of the tubes.

3 My invention is shown in the accompanying drawings and will be more fully de tion of the adjustable holding mechanism for one end of the mandrel, and Fig. 6 represents a top plan view thereof.

Similar reference numerals indicatecorresponding parts throughout the several figures of the drawing.

Referring to the drawings, the base 10 has standards 11, each supporting a table 12, on which the guide blocks 13 are movable. The rod 1 has the mandrel 15, as is well known, and the position of the rod 14 is regulated by the mechanism 16. This mechanism comprises a cylindrical casing 39 (see Fig. 5 especially), a piston 40 movable horizontally in said casin by means of a threaded spindle 42 extending through the head of the casing and provided with an exterior hand-wheel 41. A spindle 43 is supported-on ball hearings in said piston. This spindle extends through the opposite end of said casing and is provided with an exterior head 44 having an angular socket adapted to be engaged by the angular terminal of the rolling bar 14. Rotary motion is imparted'to the rolling bar 14 by a seemless tube blank which engages the mandrel 15 at the outer end thereof, said blank being rotated by the action of the three forming rollers in the usual manner. Each of the guide blocks 13 is composed of two parts 17 and 18, hinged at 19, and having projections 20 and 21 for engaging corresponding guides 22 and 23, suitably arranged on the tables 12 or alongside thereof for the purpose of guiding the guide blocks 13. The guide blocks are arranged in two parts pivoted to each other to be readily open a le.

As is well known, the mandrel 15 is pro erl y positioned with nic'ety, to carry out t e ob ect for which it is intended to be used, cooperating in the usual manner with three formin rolls, not shown. Simultaneous, therewith, the guide blocks 13, either two or as many as are desired, are placed in position. As the tube is formed, the tube moves the guide blocks as heretofore, but

instead of moving the first guide block along the inside of the entire easing, the first guide block is only moved to the end of the first table. Vihen it has reached the end of this table, the guide block, having passed out of the guide grooves, falls to the ground, opening either automatically or under manual "operation, the o )ellflblt: feature thereof permitting this. Tl

1e guide-block having passed out of, the guide grooves may. as stated, fall either tothe ground, or be in a position on the rod where it may be readily removable either b hand or :mtomatieally, from the. rod, without falling on the ground. 'lhereupon, the end of the drawn tube moves far ther along until it encounters the next guide block, whereupon the sauna operation takes plate, and so on. As these guide blocks fall from the rod 14 to the floor, the worlnnen pick them up, and get them into shape for the nexttube forming, placing them in a handy place within convenient reach. The rod 14 being exposed may be conveniently cooled by jets of water Without interference with. the progress oi the work. The advantage therefore is that a two-part guide blorh is used directly at those parts Where it ought to be, whereas in the old form, the guide blocks had to be pushed to these places. Furthermore, by keeping the rod at" 'all times in position and cooling the same, an appreciably higher effectiveness results, and better quality'of tubes is obtained.

In Fig; 3 is shown a different form of guide block, in which the pivot 30 connects two members 31 and32, the angular parts 33 and 34 of Whiehengage stationary guide; 35 and 36 while Fig. 4 shows a circular ex circular 'terior 37 engaging stationary gUHlQS The invention IS applurable to the three rollers of tho Manneslnann n-om-ss, and also to the other process s, as ior instant-e the Stiet'el prom-as in \vhirh two ('onirul rollers are used. Oi course, the invention is applicable to any other methods. and T have shown several embodiments, butrit is clear that el'iangrs: may be made therein without de arting from the spirit of my invention.

Iaving thus desrribed my invention, I claim as new and (lt'hll'l! to serznre by Letters Patent 1.. In a tube rolling mill the eombinatioi or' guir leways,guidehlorlcsroinposed o'l sepm l'able sections adapted to traverse said guide- Ways, and a rolling mandrel bar engaging said'guideblorleg said bloeks being adapted to be engaged and pushed by the tube being rolled and being free to drop off said ba when passing oll' the ends of said guideways.

2. In a tube rolling mill the mnnbination of guideu'ays. guidebloelcs composed of hinged separable sections adapted to traverse said guiden'ays. and a. rolling: mandrel bar engaging said guidebloeks, said blocks being adapted. to be engaged and pushed by the tube being rolled and being free to drop off said bar when passing otf the ends of said guideuays.

In testimony that I claim the foregoing as my invention, I have signed my nalnedn presenee of two subscribing witnesses.

LUD WI G "OLFFGR AM itn Jon. BIHBAND, T. LEWIS NATHAN 

